SU1634730A1 - Device for controlling the process of solution regeneration - Google Patents

Description

one

(21) 4335279/12

(22) 10/20/87

(46) 03/15/91. Bksh. Number 10

(72) Yu. N. Yastremsky, A.N. Parfenov

and A.F. Gromozdov

(53) 66.912-52 (088.8)

(56) Yastremskhiy Yu.N. and others. Automation of the processes of obtaining artificial fibers and films. M.: NINTZHIM, 1979, vol. 13 (163), p. 19-20.

(54) DEVICE MANAGEMENT OF THE SOLUTION REGENERATION PROCESS

(57) The invention relates to the chemical industry and can be used in the preparation of polymeric materials. The purpose of the invention is to improve the accuracy of control. In normal operation, the regulator acts on the actuator for feeding the coolant; in emergency mode, it acts on the actuator for feeding the coolant. Changing the device structure, i.e. its adaptation is carried out with the help of a comparator, a switch, setters, and a simulator, 1Cp, 1 slug.

The invention relates to the chemical industry and can be used to control the process of regeneration of solutions, in particular molding, in the production of polymeric materials.

The purpose of the invention is to improve the accuracy of control.

The drawing shows a functional diagram of the device.

The scheme contains a mixer 1, heat exchangers 2, 3 for heating and cooling the solution, actuators 4.5 for supplying heat and coolants, block 6 modeling, switch 7, sensor 8 limit position of the actuator, temperature controller 9, comparator 10, converter 11, temperature sensor 12, temperature setpoint 13, sulfuric acid concentration sensor 14, solution density sensor 15, sulfuric acid consumption regulator 16, regenerated solution consumption regulator 17,

actuators 18 and 19, mixer 20, masters 21-27 of the working solution of the precipitating bath at the exit of the heat exchangers, supplying the coolant, supplying the coolant to the layering solution, regenerated solution, sulfuric acid solution, spent solution of the precipitating bath, Sensor 12 of the solution temperature installed at the mixer 1 output. The sensor 12 output is connected via converter 11 with the inputs of the comparator 10 and the regulator 9. The second input of the comparator 10 is connected to the output of the setpoint 13. The outputs of the comparator 10, the regulator 9 The setting device 8 is connected to the input of the switch 7. The outputs of the unit 7 are connected to the input of the actuator 4 for supplying coolant (hot water) to the heat exchanger 2 and through the block 6 of simulation with the input for the actuator 5 installed on the refrigerant supply line 23 (brine or chilled water ) in tep (L

about

00 Ј

one

GO

The sensor of the density sensor 15 solution 15 is connected through the regulator 17 to the input of the actuator 19, the sensor output 14 is concentrated sulfuric acid solution B through the regulator JG sp ean with the input of the actuator 19. The sensors 14 and 15 y- stitnoilen at the exit of the mixer 20

The device works as follows.

The spent solution of the precipitation vail 7 is fed and the mixer 20 and then through the coolant 2 and 3 and the mixer 1 of the GOST Pasm1 to the production

An idling of the composition of the spent material in a mixture of 20 is added with: acid, a solution of regenerated (placated) and plastic baths,

The regulator 16 stabilizes the concentration in the solution of sulfuric acid by means of the action of the executive engine 13 installed on the main line and 1) supplying the acid to the mixer 20.

Re; spacing 7 of the solution of solution. imposes on the executive; -iexa-- chkz i H, mounted on the main line, and the mixer of the regenerated solution is condemned to the bath.

The regulator 9 of the temperature of the solution, acting on the actuator A on the pump-supply magnet 22, stabilizes the temperature at the outlet of the mixer 1 (normal operation) or on the actuator 5 on the mainstay of the supply system 23 (in emergency The temperature of the solution at the exit of the mixer 20 is higher than the allowable value, for example, due to the introduction of plasticization baths with a temperature of 90 ° C, as well as in the autumn and spring regimes of 5 m of equipment and sharp fluctuations temperate ur outdoor air night-day).

In this case, it is necessary to change the control channel — go from heating the solution to its cooling.

System structure change, i.e. its adaptation is made from the cogging comparator 10, the switch 7,, the adversaries 8, 13, and the modeling unit 6.

 The structure of the system is adapted as follows.

If there is a plus temperature deviation of 9p above the tolerance of the AO p, i.e. at, go out the computer

The rattor U forms a single signal () that switches the switch 7 to the position that connects the output of the temperature controller 9 to the input of the actuator 5, which changes the flow of refrigerant (chilled water or brine) into the heat exchanger 3. At the same time, the actuator A is disconnected from the output of the regulator 9 and is connected to the output of the setpoint 8, which forms the control signal for closing the actuator A (when the system is operating in the normal mode, the output of the setting device 8, which forms the control signal for closing the input t on executive Me- 5) input.

The technical nature and efficiency of introducing the dynamic model 6 block into the system can be summarized as follows.

From the theory of automatic control, it is known that in order to preserve the required stability margin of the automagic control system (ASR), the condition

0

Q

five

0

five

Wfirr Wv W ACI;, i O L

ILI

Wr

; reg SOP5 t,

where WACp, W0, WA, WMA1, Wper transfer functions are, respectively, the control system and the whole, the object of the control, the sensor, the actuator, the controller.

When the ACP structure changes (control channel change), the V / A and WHM operators can be assumed to be constant. Then the condition for maintaining a given degree of stability .aCF MU.FHO write in the form

(Ig

wn and / reg -w0

W

(one)

 o -per o per where superscripts 1 and 2 correspond to the ACP options with an impact on the flow of coolant (1) and coolant (2).

Using one Wp controller for both ASR channels, Expression 1 can be written as follows:

, (

wl, and I2

W -W, M, pp g lll

The operator of the WЈfA modeling unit, which ensures the invariance of the dynamic properties of the ASR to its structure changes, has

(2)

w, -WW6M WJ

Example. For specific conditions of production of the fiber Spblon after substitution - g: .puriurmgal: l1ykh npch (i.e. before the front functions, approximating the transition curves, taken

at rated load process) we get

W - (5л06б1 4 Og1254 0Х034 I eat v 544 R + 1 217 Р П7,2Р + 1

In the first approximation, the model unit can be implemented in the form of aperiodic and integrating units connected in parallel. Integral is also necessary to ensure complete closure of the operating mechanism of the AC in mode 1.

Claims (1)

1. A control unit for the solution regeneration process, which contains sensors for the concentration of sulfuric acid and the density of the solution, connected via corresponding controllers to the executive mechanisms of the supply lines for sulfuric acid and the regenerated solution to the mixer, the inputs connected to the main supply line for the spent solution osa- thirty long bath and ppashyphylpone d 0 50 ; IP i l (m B1 viw t-ciCTijnna, and exit from TCMJioofiMOHiiH1 a, friend r, - nope-j correlate to isp.pch .g ;: -J .flU SCHCH.ShY S MP 1 H. I ±. P aod n h TuruiO h coolant echl, s tat-chn- and d.P.J .: IK temperature, cocjuiiu-Hiii.m with the input of a temperature torus,, i l h h ay e so that It is equipped with a companion pore, a comet, a limit position preset, a full mechanism for mpg.com.r 11 g and: ; el and o - BciiniH, gfch Egam come out back. and a temperature sensor through the comppod subcpte cce) to the first input of co-mutago-P-), the second and third inputs of which are connected to the outputs of the limit setpoint driver and the temperature controller, the first output directly, and the second through the simulation unit - with control inputs of individual mechanisms of heat and coolness, respectively. 2, the operation according to claim. 2, that the modeling unit consists of parallel, nclcr, aperiodic and integrator of x links.